jQuery Questionnaire I

if ($("#radio_button_id").is(':checked') == true) {}

if ($('#<%=lst.ClientID %> option').size() < 1) {}

<div id="div1">
        <input type="text" />
        <input type="text" />
        <input type="text" />
        <input type="button" />
    </div>

<script language="javascript" type="text/javascript">
        $(document).ready(
            function () {

                $('div#div1').children().each(function () {

                    var nodeName = this.nodeName.toLowerCase();

                    if (nodeName == "input" && $(this).attr('type') == "text") {
                        $(this).attr('value','hi');
                    }                   

                });
            });
    </script>

$("#<%=list_box_id.ClientID %>").append('<option value="value_of_text">text_you_want_to_show</option>');

<script type="text/javascript">
        $(document).ready(function () {            
            //  For design mode
            $('#<%=editor.ClientID%>').find('iframe').focus(function () {
                alert("focus event fired for Design mode");
            });
            //  For HTML mode
            $('#<%=editor.ClientID%>').find('textarea').focus(function () {
                alert("focus event fired for HTML mode");
            });
        });
</script>

<script type="text/javascript">
        $(document).ready(function () {
            //  For design mode            
            var isctrlKeyPressed = false;
            $('#<%=editor.ClientID%>').find('iframe').load(function () {
                $('#<%=editor.ClientID%>').find('iframe').contents().bind("keydown keypress", function (e) {                    
                    if (isctrlKeyPressed) 
                        return false;
                    
                    if (e.keyCode == 17) 
                        isctrlKeyPressed = true;                    
                    else 
                        isctrlKeyPressed = false;
                    
                });

                $('#<%=editor.ClientID%>').find('iframe').contents().bind("keyup", function (e) {
                    if (e.keyCode == 17)
                        isctrlKeyPressed = false;
                });
            });


            //  For HTML mode
            $('#<%=editor.ClientID%>').find('textarea').bind("cut copy paste", function (e) {
                e.preventDefault();
            });

        });
    </script>

Query/Feedback